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I can let you know in the summer how they behave. Minnesota is capable of high temps and humidity. I wouldn't suspect it would differ as I don't think it's an adhesive material, but more of a design...

I found "Grip Mats" to be convenient for Sails of glory. These are made of neoprene just like standard neoprene mats, but the surface is designed differently. The surface has a slight suction effect...

Hi Norman,

I found an Etsy shop that sells "Grip Mats". It will be arriving later tonight so I'll update on my thoughts. The features are thin and light, custom sizing, and grips miniatures...